John W. Pilley, a professor emeritus of psychology at Wofford College, trained Chaser the border collie to recgnize more than 1,000 words Over the years, she learned to recognize the names of 800 stuffed animals, 116 balls, 26 Frisbees and a mishmash of plastic toys.
https://www.cbc.ca/radio/asithappens/as-it-happens-tuesday-edition-1.5230248/chaser-the-border-collie-that-could-recognize-more-than-1-000-words-has-died-1.5230263